Guo Moruo (November 16, 1892 – June 12, 1978), courtesy name Dingtang, was a Chinese author, poet, historian, archaeologist, and government official.

Guo Moruo, originally named Guo Kaizhen, was born on November 10 or 16, in the small town of Shawan, located on the Dadu River some 40 km (25 mi) southwest from what was then called the city of Jiading (Lu) (Chia-ting (Lu), 嘉定(路)), and now is the central urban area of the prefecture level city of Leshan in Sichuan Province.

At the time of Guo's birth, Shawan was a town of some 180 families.

Guo's father's ancestors were Hakkas from Ninghua County in Tingzhou Prefecture, near the western border of Fujian. They moved to Sichuan in the second half of the 17th century, after Sichuan had lost much of its population to the rebels/bandits of Zhang Xianzhong (c. 1605–1647). According to family legend, the only possessions that Guo's ancestors brought to Sichuan were things they could carry on their backs. Guo's great-grandfather, Guo Xianlin, was the first in the family to achieve a degree of prosperity. Guo Xianlin's sons established the Guo clan as the leaders of the local river shipping business, and thus important people in that entire region of Sichuan. It was only then that the Guo clan members became able to send their children to school.

Guo's father, one of whose names may possibly have been Guo Mingxing (1854–1939), had to drop out of school at the age of 13 and then spent six months as an apprentice at a salt well. Thereafter he entered his father's business, a shrewd and smart man who achieved some local renown as a Chinese medical doctor, traded successfully in oils, opium, liquor, and grain and operated a money changing business. His business success allowed him to increase the family's real estate and salt well holdings.

Guo's mother, in contrast, came from a scholar-official background. She was a daughter of Du Zhouzhang, a holder of the coveted jinshi degree. Whilst serving as an acting magistrate in Huangping prefecture (黄平州), now part of Qiandongnan Miao and Dong Autonomous Prefecture, in eastern Guizhou, Du died in 1858 while fighting Miao rebels, when his daughter (the future mother of Guo Moruo) was less than a year old. She married into the Guo family in 1872, when she was fourteen.

Guo was the eighth child of his mother. Three of his siblings had died before he was born, but more children were born later, so by the time he went to school, he had seven siblings.

Guo also had the childhood name Guo Wenbao ("Cultivated Leopard"), given due to a dream his mother had on the night he was conceived.